#!/usr/bin/env python
# -*- coding: utf-8 -*-

sample1 = set('understand')  # 用string初始化set
print(sample1)

myList = [4, 6, -1.1, 'English', 0, 'Python']
sample2 = set(myList)  # 用list初始化set
print(sample2)

sample3 = frozenset(myList)  # 初始化frozenset
print(sample3)
